EP 1367756 A2 20031203 - Turbo trellis coded modulation codec with variable code rate and signal constellation
Title (en)
Turbo trellis coded modulation codec with variable code rate and signal constellation
Title (de)
Turbo-trelliskodierte Modulation Codec mit variabler Koderate und Signalkonstellation
Title (fr)
Codec pour modulation en trellis turbo-codées avec débit de codage et constellation de signal variable
Publication
Application
Priority
- US 38469802 P 20020531
- US 26448602 A 20021004
Abstract (en)
Variable code rate and signal constellation turbo trellis coded modulation (TTCM) codec. A common trellis is employed at both ends of a communication system (in an encoder and decoder) to code and decode data at different rates. The encoding employs a single TTCM encoder whose output bits may be selectively punctured to support multiple modulations (constellations and mappings) according to a rate control sequence. A single TTCM decoder is operable to decode each of the various rates at which the data is encoded by the TTCM encoder. The rate control sequence may include a number of rate controls arranged in a period that is repeated during encoding and decoding. Either one or both of the encoder and decoder may adaptively select a new rate control sequence based on operating conditions of the communication system, such as a change in signal to noise ratio (SNR).
IPC 1-7
IPC 8 full level
G11B 20/18 (2006.01); H03M 13/25 (2006.01); H03M 13/29 (2006.01); H03M 13/41 (2006.01); H03M 13/45 (2006.01); H04L 1/00 (2006.01)
CPC (source: EP US)
G11B 20/18 (2013.01 - EP US); H03M 13/1102 (2013.01 - EP US); H03M 13/256 (2013.01 - EP US); H03M 13/258 (2013.01 - EP US); H03M 13/27 (2013.01 - EP US); H03M 13/2767 (2013.01 - EP US); H03M 13/2771 (2013.01 - EP US); H03M 13/2785 (2013.01 - EP US); H03M 13/2957 (2013.01 - EP US); H03M 13/4123 (2013.01 - EP US); H03M 13/4161 (2013.01 - EP US); H04L 1/0041 (2013.01 - EP US); H04L 1/005 (2013.01 - EP US); H04L 1/006 (2013.01 - EP US); H04L 1/0066 (2013.01 - EP US); H04L 1/0068 (2013.01 - EP US); H04L 1/0071 (2013.01 - EP US); H03M 13/45 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1367756 A2 20031203; EP 1367756 A3 20101027; US 2003223506 A1 20031204; US 2007016841 A1 20070118; US 7093187 B2 20060815; US 7406650 B2 20080729
DOCDB simple family (application)
EP 03012508 A 20030602; US 26448602 A 20021004; US 49172906 A 20060724